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Titolo:
GENETIC-ANALYSIS OF MORPHOLOGIC TRAITS OF TESTICLES AND THEIR CORRELATIONS TO PATERNAL NON-RETURN-RATE AS WELL AS TO GROWTH AND CARCASS TRAITS IN GERMAN SIMMENTAL
Autore:
PEX G; SINOWATZ F; AVERDUNK G; DISTL O;
Indirizzi:
UNIV MUNICH,INST TIERZUCHT,VET STR 13 D-80539 MUNICH GERMANY UNIV MUNICH,INST TIERANAT MUNICH GERMANY BAYER LANDESANSTALT TIERZUCHT GRUB GERMANY
Titolo Testata:
Zuchtungskunde
fascicolo: 5, volume: 68, anno: 1996,
pagine: 346 - 356
SICI:
0044-5401(1996)68:5<346:GOMTOT>2.0.ZU;2-L
Fonte:
ISI
Lingua:
GER
Soggetto:
SCROTAL CIRCUMFERENCE; HEREFORD BULLS; REPRODUCTIVE TRAITS; ADJUSTMENT FACTORS; SERTOLI CELLS; BEEF BULLS; HERITABILITIES; SPERMATOGENESIS; NUMBERS; CATTLE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
22
Recensione:
Indirizzi per estratti:
Citazione:
G. Pex et al., "GENETIC-ANALYSIS OF MORPHOLOGIC TRAITS OF TESTICLES AND THEIR CORRELATIONS TO PATERNAL NON-RETURN-RATE AS WELL AS TO GROWTH AND CARCASS TRAITS IN GERMAN SIMMENTAL", Zuchtungskunde, 68(5), 1996, pp. 346-356

Abstract

Morphological traits of testicles were investigated in 10 progeny groups each consisting of 8 bulls of the breed German Simmental. The bulls had undergone the progeny test for growth and carcass traits and were slaughtered at an age of 500 pays. The weight of the average of bothtesticles amounted to 350 +/- 54 g, the length of the testicles was 129 +/- 8 mm, the width of testicle was 71 +/- 4 mm, the circumference of testicle was 205 +/- 12 mm and the volume of the testicular parenchym was 287 +/- 47 cm(3). Per tubular diameter there were counted 16.5 /- 0.6 Sertoli cells, 2.6 +/- 0.4 A-spermatogonia and 11.2 +/- 0.7 B-spermatogonia. The heritability estimates in a half sib analysis were low to medium. A significant positive correlation was found between the volume of the testicular parenchym and the breeding values for the paternal Non-Return-Rate 90 days after first insemination (NR90). However, no significant relationships could be established between the breeding values for the paternal NR90 and the number of the different celltypes per tubular diameter of the germ cell cycle. The breeding values for growth rate and carcass quality showed no significant correlations to all testicular traits examined. The results found may be concluded that the total number of Sertoli cells and spermatogonia cells may cause the positive genetic correlation among paternal fertility and testicular parenchym, whereas differences in germ cell maturation among sires seem to be of minor importance for paternal insemination results. It can be supposed that genetic differences in releasing and action of gonadotropins may exist and these may be responsible for the positive genetic correlation among paternal NR90 and testicular parenchym.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 22:04:58